The discounted rate is available to those buying a property with an energy efficiency rating of A or B.

The range includes two and five-year fixed rates, available between 60% and 85% loan-to-value.

Rates start at 1.33%, and come with a product fee of £995 and £250 cashback.

NatWest pointed to research it had recently carried out, which found that 70% of its customers were concerned about climate change but unclear on how they could reduce their carbon footprint.

It has previously outlined its ambition for 50% of the bank’s mortgage book to be at or above the energy performance certificate rating of C by 2030.

Miguel Sard, managing director of home buying an ownership at NatWest Group, noted that properties make up around 15% of the UK’s total climate emissions, and suggested that helping to address climate change is one of the “core parts of our purpose as a bank”.

He continued: “Our customers are increasingly interested in purchasing energy efficient homes and by offering those customers a lower mortgage rate, we want to have a positive impact on the environment. This is just one of many ways NatWest is supporting and encouraging greener choices.”